.contact-form{
	width: 70%;
	position: absolute;
	top: 20%;
	left: 35%;
}
.tree{
	position: relative;
	top: 420px;
	left: 260px;
}
.contact-form ul{
	width: 750px;
	list-style: none;
	margin: 0px;
	padding: 0px;
}
.contact-form li{
	padding: 12px;
	border-bottom: 1px solid #eee;
	position: relative;
}
.contact-form h2,.contact-form span{
	font-family: Georgia, 'Times New Roman', Times, serif;
}
.contact-form li:first-child,
.contact-form li:last-child{
	border-bottom: 1px solid #777;
}
.contact-form h2{
	margin:0;
}
.contact-form samp{
	width: 150px;
	margin-top: 3px;
	display: inline-block;//转为块状元素
	padding: 3px;
}
.usually input{
	height: 20px;
	width: 220px;
	padding: 5px 8px;
}
.contact-form textarea{
	padding: 8px;
	width: 300px;
}
..contact-form button{
	margin-left: 156px;
}
.special input{
	height: 15px;
	width: 40px;
	padding: 5px 8px;
}
.usually input,
.usually textarea{
	background: #fff url(image/attention.png) no-repeat 98% center;
	border: 1px solid #aaa;
	box-shadow: 0px 0px 3px #ccc,0 10px 15px #eee inset;
	border-radius: 2px;
	transition: padding .25s;
}
.usually input:focus,
.usually textarea:focus{
	background: #fff;
	border: 1px solid #555;
	box-shadow: 0 0 3px #aaa;
	padding-right: 70px;
}
.usually input:focus:invalid,
.usually textarea:focus:invalid{
	background: #fff url(image/warn.png) no-repeat 98% center;
	box-shadow: 0 0 5px #d45252;
	border-color: #b03535;
}
.usually input:required:valid,
.usually text :required:valid{
	background: #fff url(image/right.png) no-repeat center;
	box-shadow: 0 0 5px #5cd053;
	border-color: #28921f;
}
button.submit{
	background-color: #68b12f;
	//背景颜色渐变 由上至下
	background: linear-gradient(top,#68b12f,#50911e);
	border: 1px solid #509111;
	border-bottom: 1px solid #5b992b;
	border-radius: 3px;
	box-shadow: inset 0 1px 0 0 #9fd574;
	color: white;
	font-weight: bold;
	padding: 6px 20px;
	text-align: center;
	text-shadow: 0 -1px 0 #396715;
}
button.submit:hover{
	opacity: .85;
	cursor: pointer;
}
button.submit:active{
	border: 1px solid #20911e;
	box-shadow: 0 0 10px 5px #356b0b inset;
}